Developed to protect the horsepower diesel enthusiasts crave and extend the life of hard-working commercial equipment in the most severe conditions. Signature Series synthetic technology delivers max-duty protection in on- and off-road applications.

See the Product Data Bulletin for full details.

MAXIMUM ENGINE PROTECTION

• Delivers 4X better cold-temperature performance¹
• Provides long-lasting wear protection, keeping cylinder liners looking like new²
• Delivers up to 60 percent better turbo cleanliness³
• Withstands the extra demands you place on the turbo when pulling heavy loads or updating the tune for maximum horsepower
• Provides up to 2X better rust protection⁴

¹When compared to SAE 15W-40 oil in the ASTM D5293 Cold Cranking Viscosity test
²Based on independent testing of AMSOIL 5W-30 Signature Series Max-Duty Synthetic Diesel Oil and a leading conventional 15W-40 diesel oil using the Detroit Diesel* DD13 Scuffing test for specification DFS 93K222.
³Based on specification standards of CAT C13 2nd Ring Top Land Carbon testing
⁴Based on industry standard testing using the NMMA FC-W Rust Test.

AMSOIL FIGHTS WEAR

AMSOIL delivers powerful engine protection. How good is it? In third-party testing compared to a leading brand, AMSOIL provided long-lasting wear protection, keeping cylinder liners looking like new.^DD

^DDBased on third-party testing of AMSOIL 5W-30 Signature Series Max-Duty Synthetic Diesel Oil and a leading conventional 15W-40 diesel oil using the Detroit Diesel* DD13 Scuffing test for specification DFS 93K222. *All trademarked names and images are the property of their respective owners and may be registered marks in some countries. No affiliation or endorsement claim, express or implied, is made by their use.

KEEPS TURBOS CLEAN

AMSOIL Signature Series Max-Duty Synthetic Diesel Oil provides protection boosted to the max, delivering up to 60% better turbo cleanliness^J and withstanding the extra demands you place on the turbo when pulling heavy loads or updating the tune for maximum horsepower.

^JBased on specification standards of CAT C13 2nd Ring Top Land Carbon testing

PROTECTS AGAINST RUSH

Provides up to 2X better rust protection.^K

^K Based on industry standard testing using the NMMA FC-W Rust Test.

VISCOSITY CONTROL

• Resists oxidation and the thickening effects of soot contamination
• Retains viscosity after high-temperature service for maximum engine protection and efficiency
• Provides up to 76 percent less oil consumption⁵

⁵Than required by the API CK-4 standard in the Caterpillar-1N oil consumption test

REDUCES OIL CONSUMPTION

Signature Series Max-Duty Synthetic Diesel Oil provides up to 76% less oil consumption.^L

^LThan required by the API CK-4 standard in the Caterpillar-1N oil consumption test.

EXCELS IN EXTREME TEMPERATURES

• Provides outstanding protection and performance in hot and cold temperature extremes
• Resists thermal (heat) breakdown better than conventional and competing synthetic diesel oils.
• Stays fluid in sub-zero temperatures for easier starting, improved oil flow and reduced wear.

EXCELS IN EXTREME COLD

AMSOIL 0W-40 Signature Series Max-Duty Synthetic Diesel Oil delivers 4X better cold-temperature performance when compared to SAE 15W-40 oil in the ASTM D5293 Cold Cranking Viscosity test.

See the Product Data Bulletin for full details.